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Re: MinGW x86_64 ABI problem
On Mon, Feb 23, 2009 at 5:33 PM, John Fine <johnsfine@verizon.net> wrote:
>
> The Windows version of the x86_64 ABI specifies that registers xmm6-xmm15 be callee saved.
>
> I'm building a .dll with MinGW used by an .exe from a different compiler.
>
> I debugged a failure to the point of determining that the code produced by MinGW clobbers xmm9 in violation of the ABI.
>
> I tried a bunch of Google searches, expecting this problem would be discussed somewhere, but couldn't find it.
>
> I'm using a downloaded binary copy of MinGW for x86_64. ?I expect I will need to download source code and figure out how to build it, in order to deal with this problem.
>
> But I don't know where to look in the gcc source code included in MinGW for the registers that should be callee saved.
>
> 1) Can you tell me where callee saved registers are specified in the gcc source code.
>
> 2) I tried adding "-f-call-saved-xmm9" to the g++ command to see if that would fix the problem for one register. ?That compile aborted with
> internal compiler error: in copyprop_hardreg_forward_1, at regrename.c:1590
> Is that switch so incorrect? ?I understand it would generate .obj code incompatible with anything generated without that switch. ?But why should it crash gcc?
>
First, I added both the mingw-w64 mailing list to the chain as well as
Kai Tietz.
Second, what version of the toolchain are you using? Is it from our
site? Is it after Jan 19th of 2009?